21162236 has 6 divisors (see below), whose sum is σ = 37033920. Its totient is φ = 10581116.

The previous prime is 21162217. The next prime is 21162247. The reversal of 21162236 is 63226112.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645276 + ... + 2645283.

It is an arithmetic number, because the mean of its divisors is an integer number (6172320).

Almost surely, 2^21162236 is an apocalyptic number.

It is an amenable number.

21162236 is a deficient number, since it is larger than the sum of its proper divisors (15871684).

21162236 is a wasteful number, since it uses less digits than its factorization.

21162236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290563 (or 5290561 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21162236 is about 4600.2430370579. The cubic root of 21162236 is about 276.6010670103.

Adding to 21162236 its reverse (63226112), we get a palindrome (84388348).

The spelling of 21162236 in words is "twenty-one million, one hundred sixty-two thousand, two hundred thirty-six".